A train of the Guangzhou Metro Line 18 pulls out for a hot-running test in Guangzhou, south China's Guangdong Province, March 3, 2021.(Photo: Xinhua)
A train of the Guangzhou Metro Line 18 pulls out for a hot-running test in Guangzhou, south China's Guangdong Province, March 3, 2021.(Photo: Xinhua)
A train of the Guangzhou Metro Line 18 is seen during a hot-running test in Guangzhou, south China's Guangdong Province, March 3, 2021.(Photo: Xinhua)
A train of the Guangzhou Metro Line 18 is seen during a hot-running test in Guangzhou, south China's Guangdong Province, March 3, 2021.(Photo: Xinhua)